Elsevier

Developmental Biology

Volume 23, Issue 3, November 1970, Pages 456-477
Developmental Biology

An analysis of developmental fields

https://doi.org/10.1016/0012-1606(70)90110-7Get rights and content

Abstract

Critical examination of variation of appropriate adult structures can give information on their ontogeny. In a Cretaceous insectivore, the patterns of serial variation of cheek tooth structures exhibit many kinds of morphological gradients. All these observed gradients can be explained by a minimum of two or three embryological gradients acting on a prepattern that is common to each tooth primordium. Three dichotomous signals are necessary for other features. Thus the simplest program of dental ontogeny can be derived. Extensions, tests, and other matters are discussed.

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      2011, Journal of Human Evolution
      Citation Excerpt :

      The less pronounced morphological change observed in second premolars would nevertheless be correlated across the upper and lower rows to an even stronger degree (Fig. 10). A strong integration among adjacent teeth is expected based on spatial interactions due to contiguity during development (Van Valen, 1970), although metameric variation exists (Braga et al., 2010). However, the correlated reduction of distal areas of premolars (talons and talonids) through hominin evolution might point to a pattern of morphological evolution similar to that proposed by Hlusko and colleagues (Hlusko et al., 2004) for baboon molar variation.

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    A Research Career Development Award from the National Institutes of Health partly supported this work.

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